package com.hmdp.upload.controller;

import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.StrUtil;
import com.hmdp.common.utils.SystemConstants;
import com.hmdp.model.dto.Result;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import java.io.File;
import java.io.IOException;

@Slf4j
@RestController
@RequestMapping("/upload")
public class UploadController {

    @PostMapping("/blog")
    public Result uploadImage(@RequestParam("file") MultipartFile image) {
        try {
            // 获取原始文件名称
            String originalFilename = image.getOriginalFilename();
            // 生成新文件名
            String fileName = createNewFileName(originalFilename);
            // 保存文件
            image.transferTo(new File(SystemConstants.IMAGE_UPLOAD_DIR, fileName));
            // 返回结果
            log.info("文件上传成功，{}",fileName);
            return Result.ok(fileName);
        } catch (IOException e) {
            throw new RuntimeException("文件上传失败", e);
        }
    }

    // 生成新的文件名
    private String createNewFileName(String originalFilename) {
        // 获取后缀
        String suffix = StrUtil.subAfter(originalFilename, ".", true);
        // 生成目录
        String name = UUID.randomUUID().toString();
        int hash = name.hashCode();
        int d1 = hash & 0xF;
        int d2 = (hash >> 4) & 0xF;
        // 判断目录是否存在
        File dir = new File(SystemConstants.IMAGE_UPLOAD_DIR, StrUtil.format("/blogs/{}/{}", d1, d2));
        if (!dir.exists()) dir.mkdirs();
        // 生成文件名
        return StrUtil.format("/blogs/{}/{}/{}.{}", d1, d2, name, suffix);
    }

}
